[quasi]

You don't have to take Criminology an education of some sorts does help and is a requirement in most cases. Volunteer work is huge, do lots of it and all kinds of it. The obvious stuff, stay out of trouble don't break the law obviously. Don't do drugs of any kind. Have good credit it does matter. Don't associate with people who are on the wrong side of it.

I don't know how old you are but keep in mind they generally like to higher people with some life experience. There are exceptions but age and experience does not hurt you and youth may hinder. I'd actually also recommend getting a job where you deal with people. Having past experience with the ability to deal with different people and situations can only help you.

If you get further in the process they'll have you fill out this questionnaire with a huge range of questions. Have you done drugs? When and where is the last time? Have you been in an at fault accident? When and where? Have you ever committed a hit and run? When and where? Do you associate with anyone with a criminal record? Who? Have you ever solicited sex from a prostitute? List all your tickets, where they happened and when. Have you ever stolen anything?

This questionnaire has tons of questions. So you'll fill it out and go in for an interview and then they'll ask you all the questions. Get you to go into detail about some of the things like what you were thinking why you did it or whatever. If you get further in the process they'll ask you the same questions again except this time you'll be hooked up to a polygraph. If they find out you lied about anything the process is over.

There is more to it then that but that is one of the things to expect.